periodic perturbation effect on degenerate states

periodic perturbation effect on degenerate states: Макаров: действие периодического возмущения на вырожденные состояния

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K·p perturbation theory — In solid state physics, k·p perturbation theory is an approximation scheme for calculating the band structure (particularly effective mass) and optical properties of crystalline solids. It is pronounced k dot p , and is also called the k·p method … Wikipedia
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